JPS60244311A - Lower liquid collection apparatus in filter - Google Patents

Abstract

PURPOSE:To provide the titled apparatus wherein uniform filtering is enabled by enlarging an open area and backflow water can be sent uniformly and effectively, constituted by providing a drainboard shaped filter material receiver in a filter to support a filter material on the upper surface thereof and forming a liquid collection chamber under said receiver. CONSTITUTION:In a filter machine 50, a filter material receiver 54, which is formed by laying wire like members 56 in a drainboard like shape so as to provide predetermined gaps therebetween and fixing said members 54, is constituted on the support member 58 supported on supports 52 erected on a bottom plate 10. Each of the wire like members 56 is formed so as to have an inverted triangular cross-sectional area and the gaps 50 between said members 51 are sent so as to be able to directly lay a filter material 23 without laying gravels to constitute a clogging preventing structure. A water collection chamber 61 is formed under the above-mentioned filter material receiver 54 and a uniform backflow generation pipe 62 is arranged in said chamber 61 and, at the time of filtering, a filtrate is introduced into said pipe 62 through a large number of small apertures 64 opened to the peripheral surface thereof at appropriate intervals and, at the time of backwashing, backwashing water is injected so as to obtain a uniform stream over the entire surface of the filter material receiver 54 through the water collection chamber 61 to prevent a sand boiling phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a lower liquid collection device for filtration in water treatment and other industrial processes.

[Prior art]

Currently the most commonly used filtration method in water treatment facilities.
The method used is the so-called gravity method, in which sand is used as a furnace material to filter downwards, and backflow water is used for cleaning. In this gravity filtration type, the lower liquid collection device
This is to support the entire furnace material to prevent its infiltration, filter and extract friendly water, or supply backflow water.

An example of a conventionally used lower water collection device is shown in FIGS. 2 to 4.

FIG. 2 shows what is called a boiler type. (a) shows a plan view, and (b) shows a sectional view taken along the line A-& in (a). This lower water collection device has a support 12 erected on the bottom plate 10 of the pond, and a concrete molded product 14 is completely fixed thereon. A water collection chamber 16 is provided between the concrete molded product 14 and the bottom plate 10.
is formed. A side concave-shaped recess 18 is formed on the upper surface of the concrete molded product 14, and 5 large and small recesses 11 are formed in the upper surface of the concrete molded product 14.
14 white balls 20 are arranged in a row, and a furnace material 23 is placed on top of them with a gravel layer 21 interposed therebetween. A water collection hole 22 communicating with the water collection chamber 16 is opened in the center of the recess 18.
This water collection hole 22 is completely passed through to collect water and backflow water for cleaning.

FIG. 3 shows what is called a perforated block type. (,) shows a plan view, and (b) shows a BB sectional view of (,). This lower water collection device has molded blocks 28 having a dispersion chamber 24 and a water supply chamber 26 arranged on a bottom plate 10. Furnace material 23
is laid on the upper surface of the molded block 28 via a gravel layer 21.
Ru. A dispersion chamber 24 and a water supply chamber 2 communicated through an orifice 30.
The pressure equalization effect achieved by the two-stage structure 6 and the large number of water collection holes arranged on the upper surface of the molded block 28 ensure uniform filtration and backwashing effects in a plane.

Figure 4 shows what is called a strainer type, in which a water collection pipe 32 is laid on the bottom plate 10, concrete 34 is filled and fixed, and furnace material 21 is laid on top of it through a gravel layer 21. It is. A water collection hole 36 having a strainer 34 is formed in the upper surface of the water collection pipe 32, and water collection and backflow water are carried out through the entire water collection hole 36.

Figure 5 shows what is called a perforated pipe type, with three water collection holes on the bottom surface.
8 is fixed to the bottom plate 10 via a support 42, the entire structure is buried in a gravel layer 21, and furnace material 21 is spread over it. Water concentrates and flows back through the entire concentration hole 38 to cool it down.

Gravel layer 2 in the lower water collection device shown in Figures 2 to 5 above
1 is to prevent the water collection hole from being blocked by the furnace material (sand) 23, and is determined by the relationship between the grain size of the furnace material 23 and the water collection hole.
~ There are three layers of gravel, with large, medium, and small diameter gravel lined up in order from the bottom. During filtration, water that has passed through the furnace material 23 passes through the gravel layer and finally passes through the water collection holes and is collected in the water collection chamber (pipe).

During cleaning, the water collection chamber (pipe) becomes a pressure water chamber, and the pressurized water leaves the water collection hole, passes through the gravel layer 21, and backwashes the furnace material 23.

In the conventional lower water collection device described above, since the opening area of the water collection hole is small, careful operation is required to achieve uniform filtration. Also, when water flows back,
Since the opening area of the water collection hole is small, careful control is required in order to send uniform and effective backflow water to the furnace material 23 and the gravel layer 21 without causing sand sailing. .

[Problem to be solved by the invention]

The present invention solves the drawbacks of the prior art, has a large opening area, can filter uniformly, and can uniformly and effectively filter backflow water without causing the sand sailing phenomenon. The aim is to realize a lower liquid collection device that can be fed.

[Means to solve all problems]

This invention installs a slatted furnace material receiver inside the filter,
The furnace material is supported on its upper surface, and a liquid collection chamber is formed below it.

[Effect]

According to the solution of the present invention, since the slatted furnace material receiver has linear water collection holes, the opening area can be made wider compared to the conventional dotted water collection holes, and the water can be uniformly distributed. Water collection and backflow water can be carried out uniformly and effectively and without causing any sand sailing phenomenon.

〔Example〕

An embodiment of the invention is shown in a perspective view in FIG.

Also, the front view of Figure 1 is shown in Figure 8 (a), and the side view is shown in Figure 8 (a).
Figure (h) shows it in detail. In FIG. 1, the filter 5
A pillar 52 is erected on the bottom surface 10 of the interior, and a furnace material receiver 54 is supported on top of the pillar 52. The furnace material receiver 54 is constructed by arranging linear members 56 in a grid pattern at predetermined intervals and fixing them from below with support members 58. The furnace material 23 is directly laid on the upper surface of the furnace material receiver 54 without using gravel. The linear member 56 and the support member 58 are made of metal, for example, and fixed by welding. In this embodiment, the linear members 56 have an inverted triangular cross section and are not used.If one linear member 56 of this type is used, the gap between each member 56 can be reduced. 60 has an inverted V shape as shown in FIG. 6, so even if the furnace material 23 were to fall into the gap 60, it would not get caught there and would fall downward, preventing clogging. Therefore, if the gap is set to 6owF' slightly narrower than the diameter of the material 21, the entire furnace material 23 can be laid directly without placing gravel in between as in the conventional method.Such an effect The cross-sectional shape of the linear member 56 that can be obtained is not limited to a triangle, but may also be a trapezoid as shown in FIG. I can't help but think of the various shapes that are expanding into the world.

In FIG. 1, f'1. is formed below the furnace material receiver 54.
A pipe (uniform backflow generating pipe) 62 is arranged in the water collection chamber 61. This uniform backflow generating tube 62 is for supplying uniform backflow water to the entire surface of the furnace material receiver 54. In other words, if the uniform backflow generating pipe 62 is not guided into the water collection chamber 61, as shown in FIG. It is not possible to supply all the backflow water. Therefore, a uniform backflow generation pipe 62 is arranged in the water collection chamber 61, and small holes 64 are opened at appropriate intervals around it, and water is collected or
By backflowing water, uniform backflow water flows into the furnace material receiver 5.
It is designed to be supplied to the entire surface of the area. During filtration, the uniform backflow generating tube 44 guides the water dripping from the furnace material 23 through the furnace material receiver 54 and collected in the water collection chamber 61 through the small hole 64 and into the interior thereof. Further, during cleaning, the cleaning water supplied through the inside is ejected from the small holes 64 into the water collection chamber 42 and guided to the furnace material layer 29.

The small hole 64 of the pipe 62 is very small compared to the pipe diameter, and by creating a pressure drop when backflow water is ejected,
Make sure that the same flow rate is emitted from both the front and back sides. In addition, since the small holes 64 are mainly opened generally downward, the jet flow once hits the bottom surface 16 and then reaches the furnace material receiver 54.
This ensures that uniform flow is obtained over the entire surface.

In the embodiment shown in FIG. 1 described above, the furnace material receiver 54 is slatted and the opening is linear, so the opening area can be wider than the conventional one with point-shaped openings. I can do it,
Enables uniform filtration and uniform and effective backflow of water,
It is also possible to prevent the sand boil phenomenon when water flows back. Also, the pipe 62 in the water collection chamber 61? By installing it and spouting all the backflow water from the small holes 64, more uniform and effective backflow water becomes possible. Further, in accordance with the embodiment shown in FIG. 1, the linear member 56 of the furnace material receiver 54 has a shape in which the gap 60 expands downward, so that clogging can be prevented and no gravel is required. The furnace material 23 can be directly supported. Therefore, the thickness of the supported layer supported by the furnace material support 54 can be reduced, the load applied to the p-material support 54 is also small9, and the strength of the furnace material support 54 can be easily designed.

It also eliminates the cost of laying gravel and makes maintenance easier.

[Example of change]

In the embodiment, as the linear member 56 of the furnace material receiver 54,
A type with an opening that expands downward was used;
) or other polygonal cross-sections as shown in FIG. 10(b), or an expanded sheet-like material as shown in FIG. 10(b) can also be used. When using a furnace, in order to prevent clogging, first lay one layer of gravel 21 before laying the furnace material n.

Further, as shown in FIG. 11, the uniform backflow water generating pipe 62 is
It is also possible to arrange a plurality of them in the water collection chamber 61, or to make the small holes 64 face upward. When the small holes 64 are oriented upward, a preferable state can be achieved by providing a dispersion plate above them to ensure a uniform flow, or by arranging the small holes at an angle that allows the flow to flow uniformly over the entire surface of the grates. Get it and save it. Furthermore, the uniform backflow water generation pipe 62 does not have to be placed inside the water collection chamber 61; for example, as shown in FIG. It may also be made to protrude into the water collection chamber 61.

Furthermore, in the embodiments described above, the present invention is applied to water treatment, but it can also be applied to various industrial processes.

〔effect〕

As explained above, according to the present invention, since the furnace material is supported by the slatted furnace material receiver, the water collection holes are linear, and the water collection holes are different from the conventional dot-shaped water collection holes. Compared to this, the opening area can be made wider, and water can be collected uniformly and water can flow back evenly and efficiently without causing sand sailing.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 shows a conventional wheeler-type lower water collection device, in which (,) is a plan view and (b) is a cross-sectional view taken along line A-A in (,). FIG. 3 shows a conventional perforated block type lower water collection device, in which (,) is a plan view and (b) is a sectional view taken along line RB in (a). FIG. 4 is a front sectional view showing a conventional strainer type lower water collection device. FIG. 5 is a front cross-sectional view showing a conventional perforated tubular lower water collection device. FIG. 6 is a diagram showing the entire cross-sectional shape of the linear member 56 of the furnace material receiver 54 in the embodiment shown in FIG. FIG. 7 is a diagram showing an example of a change in the cross-sectional shape of the linear member 56. 8(a) is a front view of the embodiment of FIG. 1, FIG. 8(b) is a front view of the embodiment of FIG.
) is its side view. FIG. 9 is a diagram showing the situation of backflow water when there is no uniform backflow generation pipe 62. FIG. 10 is a diagram showing another embodiment of the furnace material receiver 54. FIG. 11 is a diagram showing another embodiment of the uniform backflow generating tube 62. FIG. 12 is a diagram showing still another embodiment of the uniform backflow generating tube 62. DESCRIPTION OF SYMBOLS 10... Bottom plate, 16... Water collection chamber, 21... Gravel layer, 23... Furnace material, 50... Filter machine, 52... Support column, 54... Furnace material receiver, 56 ... Linear member, 58...
- Support member, 60... Gap, 61... Water collection chamber, 62
... Uniform backflow generating tube, 64... Small hole. (1 other person) Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A lower liquid collection device for a filter, which includes a drainboard-shaped furnace material receiver installed in the filter, supporting the furnace material on its upper surface, and forming a liquid collection chamber below it.